linux-kernel - Re: Oops in 3.7-rc8 isolate_free_pages

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Date:	Thu, 6 Dec 2012 15:48:21 +0100
From:	Jan Kara <jack@...e.cz>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>, mgorman@...e.de,
	linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Oops in 3.7-rc8 isolate_free_pages_block()

On Thu 06-12-12 10:17:44, Henrik Rydberg wrote:
> Hi Linus,
> 
> This is the third time I encounter this oops in 3.7, but the first
> time I managed to get a decent screenshot:
> 
> http://bitmath.org/test/oops-3.7-rc8.jpg
> 
> It seems to have to do with page migration. I run with transparent
> hugepages configured, just for the fun of it.
> 
> I am happy to test any suggestions.
  Adding linux-mm and Mel as an author of compaction in particular to CC...
It seems that while traversing struct page structures, we entered into a new
huge page (note that RBX is 0xffffea0001c00000 - just the beginning of
a huge page) and oopsed on PageBuddy test (_mapcount is at offset 0x18 in
struct page). It might be useful if you provide disassembly of
isolate_freepages_block() function in your kernel so that we can guess more
from other register contents...

								Honza

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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